Multi-modal smooth control method and system for cascaded three-level buck-boost converter

A smooth control and three-level technology, which is applied in control/regulation systems, conversion equipment without intermediate conversion to AC, and adjustment of electrical variables, can solve problems such as discontinuous voltage gain, unbalanced capacitor voltage, and mode oscillation. Achieve the effects of smooth voltage gain, balanced voltage stress, and reduced loss

Active Publication Date: 2022-04-15
HUNAN UNIV
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  • Claims
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Problems solved by technology

[0018] The technical problem to be solved by the present invention is to provide a multi-mode smooth control method and system for a cascaded three-level BUCK-BOOST converter to overcome the discontinuous voltage gain caused by the dead time. problem, capacitor voltage imbalance problem, and mode oscillation problem

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  • Multi-modal smooth control method and system for cascaded three-level buck-boost converter
  • Multi-modal smooth control method and system for cascaded three-level buck-boost converter
  • Multi-modal smooth control method and system for cascaded three-level buck-boost converter

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Embodiment Construction

[0067] Figure 4 is the modulation signal d of the cascaded three-level BUCK-BOOST converter when the multi-mode smoothing control method of the present invention is not used 1 and d 2 and working mode. Figure 5 For the voltage gain and the operating mode of the cascaded three-level BUCK-BOOST converter when the multi-mode smoothing control method of the present invention is not used, it can be clearly seen that due to the modulation signal d 1 and d 2 With upper and lower limits, the voltage gain of the circuit in the dead zone is discontinuous.

[0068] In order to overcome the discontinuous voltage gain caused by the dead zone, balance the capacitor voltage and alleviate the mode oscillation phenomenon at the same time, the present invention divides the working state of the cascaded three-level BUCK-BOOST converter into four according to the capacitor voltage difference. modal, and apply the multimodal smooth control method proposed by the present invention in these fo...

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Abstract

The invention discloses a multi-mode smooth control method and system for a cascaded three-level BUCK-BOOST converter, which is applied to a cascaded three-level BUCK-BOOST converter. For the inherent dead zone, capacitor voltage imbalance and mode oscillation problems of the cascaded three-level BUCK-BOOST converter, using the multi-mode smooth control method proposed by the present invention to control the converter can solve the above problems, A smooth transition between boost and buck is achieved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a multi-mode smooth control method and system for a cascaded three-level BUCK-BOOST converter. Background technique [0002] With the increasingly prominent problems of global fossil energy shortage and environmental deterioration, and the rapid progress of new energy power generation technology, the field of distributed power generation has received extensive attention and development. In particular, photovoltaic power generation and hydropower generation have become an indispensable part of the energy structure of countries around the world. However, new energy power generation has strong uncertainties, so in order to facilitate the connection of new energy power generation to the existing power grid, the interface circuit often has a higher and wider voltage and current level. [0003] The traditional two-level DCDC converter has disadvantages such as high voltage s...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158H02M3/06H02M1/14
CPCH02M3/1582H02M3/1584H02M3/06H02M1/14
Inventor 马伏军朱真周思邈林立恒严格非匡德兴黄格林章程
Owner HUNAN UNIV
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